HT4100 4.1, 4.5, 4.9 Discussion, Problem of the day :) in Cadillac Engine Technical Discussion; I got the heater core bypassed last month after all the antifreeze was leaking into the passenger's side of the ...

Problem of the day :)

I got the heater core bypassed last month after all the antifreeze was leaking into the passenger's side of the car. Noticed yesterday that under the mat on the driver's side it is soaked with antifreeze. I do not have any leaking antifreeze on the ground, just onto the carpet. Any idea where it could be coming from and why? I guess I will bring it to where they did the heater core bypass, but still would like to find out the problem first.
Andrew and his 83 Eldorado